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When the engine starts it is cold, as it warms up it builds heat which causes condensation to form. Since heat rises so does the condensation as it tries to excape through the PVC in the valve cover. As the engine cools it has the same effect, the valve covers are thin metal or aluminum they cool quickly but the oil in the pan is hot which causes the condensation to form on the valve covers.

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Q: Why is there Moisture in the valve cover?
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